Buy a crap load of land in the middle of nowhere and build a cool house on it. Then offer to all my immediate family to buy them their own house, either pay off their current mortgages or build another one for them on the land whatever they’d prefer. Any money left over I’d use to build an accredited post-secondary school with free tuition for low income people. I’d balance the budget with investments so the school can reasonably run on it’s own for at least 100 years.